Pass the final URL an app was loaded from to the app in Initialize().

examples/forwarding_content_handler/forwarding_content_handler.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "mojo/application/application_runner_chromium.h"
 #include "mojo/application/content_handler_factory.h"
 #include "mojo/common/data_pipe_utils.h"
 #include "mojo/public/c/system/main.h"
@@ skipping 11 matching lines @@
 class ForwardingApplicationImpl : public Application {
  public:
   ForwardingApplicationImpl(InterfaceRequest<Application> request,
                             std::string target_url)
       : binding_(this, request.Pass()),
         target_url_(target_url) {
   }
 
  private:
   // Application:
-  void Initialize(ShellPtr shell, Array<String> args) override {
+  void Initialize(ShellPtr shell,
+                  Array<String> args,
+                  const mojo::String& url) override {
     shell_ = shell.Pass();
   }
   void AcceptConnection(const String& requestor_url,
                         InterfaceRequest<ServiceProvider> services,
                         ServiceProviderPtr exposed_services) override {
     shell_->ConnectToApplication(target_url_, services.Pass(),
                                   exposed_services.Pass());
   }
   void RequestQuit() override {
     RunLoop::current()->Quit();
@@ skipping 38 matching lines @@
 };
 
 }  // namespace examples
 }  // namespace mojo
 
 MojoResult MojoMain(MojoHandle shell_handle) {
   mojo::ApplicationRunnerChromium runner(
       new mojo::examples::ForwardingContentHandler());
   return runner.Run(shell_handle);
 }